Screen for stamp-mills.



No. 629,242. Patenten my la, m99.`

M. n. DmscoLL.

scm-:Eu ron sump mLLs.

(Application died Jan. 12, 1899.)

No Mndei.)

A TTOHNE YS.

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UNITEn STATES PATENT OEEICE.

MARTIN n. DEIsooLL, oF EEIsco, UTAH.

sPEcIEIcA'rroN forming part of Letters Patent Nog'eeaeee, dated July 18, 1899. Application and January 12, 1899, serial 110.701,955. (No man.;

To @ZZ whom it may concern:

Be it known that I, MARTIN RICHARD Dars- COLL, of Frisco, lin the county of Beaverfand State of Utah, have invented a new and I mproved Screen for Stamp-Mills, of which the following is a full, clear, and exact vdescription.

The object of thek invention is to provide a new and improved Iscreen for stamp-mills which is simple and durable in construction, arranged to permit a convenient and quick change of the worn-out screen-cloth without stopping the battery,and at the same time pre'- vent coarse ore from passing tothe pulp-conveyers and amalgamating-plates o'r other devices for treating the pulp. The invention consists of novel features and parts and combinations of the same, as 'will be fully describedhereinai'ter and then pointed out in the claims.

A practical embodiment of my invention is represented in the accompanyingdrawings, forming a part of this speciiication, in which similar charactersof reference indicate corresponding parts in all the views.

Figure 1 is a front elevation of the improvement. Fig. 2 is a ytransverse section of the same on the line 2 2 in Fig. 1. Fig. 3 is aseotional plan view of the same on'the line 3 3 in Fig. 1. Fig. 4 is a similar view of the same on the line 4 4 in Fig. 1. Fig. 5 is arear face viewof the improvement, and Fig. Gis a transversesection of the same on the line 6 6 in Fig. 1.

On the front A of the stamp-mill frameis arranged an'outlet-opening A', adapted to be covered by one or more screen-cloths for screening the pulp as it passes from the stampinill to the pulp-conveyers, ramalgamatingplates, or other devices employed for treating the pulp in the usual manner, the screencloth serving to 'retain the coarser pulp in the mill until it is reduced to theV desired mesh. As illustrated in the drawings, two screencloths are employed, and in order to hold the screen-cloth in place and to permit of quickly removing the worn-outl portions of the screencloth without stopping the battery I provide the following` construction.

On the face of the front A is arranged a recess adjacent to the opening A' to receive a skeleton frame provided with vertical meml `bers BV B' B2 and a bottom member B3 for connecting the vertical members with each other. The middle vertical' 'member B2 is adapted to be fastened to the front A,near the upper. end thereof, by a suitable bolt C, as is plainly indicated in Figs. 1 and 6. VOn the front face of the skeleton frame is riv eted or otherwise secured a U-shaped frame D, and on the back ofA the skeleton frame is vriveted a frame similar in shape to the skeleton frame and comprising vertical members E E'LE2 and a base member E3. (See Fig. 5.) Thel last-mentioned frame lits with` its side members into the opening A' in the front of minating a suitable distance below the top of the opening. l vrNear the upper ends of the vertical members B B B2 of the skeleton frame and at the front face thereof are arranged brackets F for carrying reels F', supporting rolls G G' of screen-cloth G2 G3, adapted to begstretched downward over the openings between the vertical members B B2 and B2 B' of the skeleton frame. The stretched portions of the screencloth G2 G? are secured in position at their sides and lower ends by U-shaped clampingframes H H', respectively, engaged by bolts l, projecting from and carried by the vertical members of the skeleton frame, each bolt being preferably provided with a wing-nut to permit the operator to conveniently screw up or unscrew the nut to press the frame in engagement with the sides and bottom portions ,of the corresponding screen-cloth. The bolts I engage elongated notches H2 in the side members of the clamping-frames H H',so that when the nuts of the bolts l are loosened then the clamping-frames can be shifted upward, as indicatedat the left in Fig. 1, when it is desired to remove the lower worn-out portion of the screen-cloth, as hereinafter more fully described. v

The extreme lower portions of the screencloth G2 and Gr8 are drawn between the bottom members of the clampingframes H H' and the bottom member B3 of the skeleton frame, to be then clamped in positionv on the frames H H' by bars J. J', each heldon bolts K, carried by the bottom 'member of the frame the stamp-mill frame, as is plainly indicated `in Figs. 3, 4, and 6, the vertical members ter- IOO V Vfront of the bottom members of the clamping- I),the bolts having wing-n uts abutting against spring-washers K to firmly press the bars J vJ against that portion of the screen-cloth Y Vgates L, each provided near its upper end with handles L to permit the operator to slide the gates upward or downward and expose more or less screen-cloth to the inside of the stampmill, as will be readily understood by reference to Fig. 2. The side edges of each gate L iit against the inner edges of the vertical members B B2and B2 B', and in order to permit a convenient sliding of the gate in an upward or downward direction the gate after adjustment is secured in place by a bolt N,

carried by the fron t A of the stamp-mill frame, said bolt extending through a vertically-'disposed slot L2 in the gates and covered at its lower portion by a plate O, hung on the bolt N.

It is understood that each gate extends directlyin the rear of the corresponding screencloth G2 G3, and when Vthe gate is moved into a lowermost position it completely closes that portion of the skeleton-frame opening to prevent the pulp from passing from thestampmill to the screen-cloth. The gate is moved down into a closed positionV when it is desired to remove a worn-outlower portion of a screencloth, it being understood that in this case the gate is lowered and then the clampingframes H or H are loosened and likewise the bars J or J. The operator is then enabled to pull on the lower end of the screen-cloth, so as to unwind the latter from the corresponding reel, andnwhen the desired amount of screen-cloth has been unwound and drawn through between the lower members of the clamping-frames and the clamping-bars J or J then the operator cuts off the worn-out portion and folds up the lower end of the cloth upon the front lo-wer member of the clamping-frame. The latter is now lowered to its former position, and the nuts on the bolts I are screwed up to fasten the clamping-plates in position, and then the clamping-bars J or J are screwed down upon the end of the screen-cloth extending over the front of the lower member of the clamping-frame. When this has been done, the operator can again raise the corresponding gate, so as to permit the pulp to pass from the interior -of the stamp-mill screen through the meshes of the screen-cloth to the apparatus for further treatment.

In order to bring the gatesLinto the proper position to prevent leakage of the pulp through the device at the time the gate is in alowermost position, I provide each gate at its rear face with a doubled-up or reinforced portion L3, adapted to slide in vertically-disposed and slightly-inclined guideways P, Secured to the bottom member E3 of the reinforcing-frame. Now it is evident that when a gate L is lowered it passes into the guideways P, and as the faces thereof are inclined the gates are pressed forward with the upturned portions L3 against the vertical members E E E2, so as to completely close the skeleton frame by the gates.

It is understood that the side edges of the screen-cloth G2 and` Gfa extend slightly upon the vertical members B B B2 of the skeleton frame to be clamped in position'thereon by the side members of the clamping-frames Il H,.so as to securely hold the screen-cloth in place, the lower portion thereof being held in place by the bottom members 'of the clamping-frames I-I'H" and the clamping-bars J J in the manner above explained.

From the foregoing it is evident that by loosening the clamping-frames and clampingbars the operator is enabled to readily loosen the screen-cloth and draw the saine downward through the skeleton frame to Ybring an unused ortion of the cloth into the opening eoveredby the corresponding gate. The portion projecting below the bottom member of the clamping-frame and folded back upon the front thereof is taken hold of by the operator to conveniently draw the screen-cloth downward as said portion of the screen-cloth forms a convenient hold;

' It will be seen by the arrangement described that itis not necessary to stop the b attery or take out the-entire frame while changing the screen-cloth to remove a worn-out portion and replace it by a new unused cloth, and consequently considerable labor is saved, and there is no danger of large particles passing from the mill to the amalgamating-plates lod while the change is taking place.V By having two screen-cloths, as described, the operator can change one for replacing worn-out portions while the other is in use, it being understood that the operator previously to making the change closes the corresponding gate L. When the screen-cloth has been changed, the operator again lifts the corresponding gate to the previous position to allow the'pulp to pass through the new screen portion.

When it is desired to repair the stamp-mill, the skeleton frame with the parts carried thereby can be readily taken ont of the front A of the mill to give ready access to the interior of the latter.

When new dies or shoes are required for the stamp-mill, then the height of discharge is readily regulated and increased by the operator raising the gates correspondingly, and when the dies or shoes have worn the gates are correspondingly lowered, as less material is now brought into a proper condition to be discharged through the screen-cloth within a given time.

l/Vhen the battery requires new shoes or dies, ample room is afforded for putting such shoes in position ,by unclamping the screencloth and reeling the latter upon thereels and lifting the gates to give access to the stampmill by way of the screen-frames.

Having thus fully described my invention,

IIO

l claim as new and desire to secure byLetters VPatent 1. A stamp-milLhaving an apertured frame.

`bolts within said recesses and an auxiliary clamping-bar engaging the outer face of the lower side' of the clamping-frame, substantially-as described. y

2. A stam p-mill,having an apertured frame,

al roll of screen material mounted above the aperture and having a portion extending over the aperture, a clamping-frame extending about the lower and side edges of the aperture and covering the edges of the screen material, means for releasably securin g the members of the clamping-frame and the screen beneath it to the screen-frame, and an auxiliary clamping-bar engaging'the outer face of the tar, a roll-of screen material mounted above the aperture and having a portion extending over the aperture, a clampingffranne extending about the lower and side edges of the aperture and covering the edges of the screen material, means for releasably securing the members of the clamping -frame and `the screen beneath it to the screen-frame, an auX- iliary clamping-bar engaging the outer face of the lower side of the` clamping-frame,'a gate mounted to slide vertically at. the rear of the screen, and inclined guides vengaging the lower edge of the gate to force it laterally to its seat as it reaches its `lowermost position, substantially as described. l 1

` MARTIN R. DRISCOLL.

Witnesses: t

' CHAS. F. GALL,

ANDREW SHELTON. 

